[Freeciv-Dev] (PR#7517) Move canvas_store functions into client/gui-.../graphics.c

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=7517 >

Oh, wait, there already is a struct canvas.  It's only used for
mapview_canvas, though.  And there's a definition for an overview struct
right below it that looks almost identical, save a couple variables.

Perhaps it could be renamed to, say, struct canvas_wrapper or something,
since it seems to wrap up a canvas_store with a few
non-implementation-dependent variables, and used for both overview and
mapview.

-James Canete